the GNU version of the Collaborative International Dictionary of English
n. The quality of being arduous; difficulty of execution.
The Century Dictionary and Cyclopedia
n. The state or quality of being arduous; difficulty of execution or performance.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. extreme effortfulness
Word Usage
"But presumption fails to honor this distinction, and therefore "fails to accept the reality of the futurity and 'arduousness' that characterize" our journey in and toward O."